package cn.com.nes.common.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class TimeCountUtil {
	   
	   
   	private static final long ONE_MINUTE = 60000L;  
       private static final long ONE_HOUR = 3600000L;  
       private static final long ONE_DAY = 86400000L;  
       private static final long ONE_WEEK = 604800000L;  
     
       private static final String ONE_SECOND_AGO = "秒前";  
       private static final String ONE_MINUTE_AGO = "分钟前";  
       private static final String ONE_HOUR_AGO = "小时前";  
       private static final String ONE_DAY_AGO = "天前";  
       private static final String ONE_MONTH_AGO = "月前";  
       private static final String ONE_YEAR_AGO = "年前";  
  
       
       public static Date StrToDate(String str) {

    	    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	    Date date = null;
    	    try {
    	        date = format.parse(str);
    	    } catch (ParseException e) {
    	        e.printStackTrace();
    	    }
    	    return date;
    	}


       
       //实际调用方法
       public static String timeCount(String date) {
    	 Date dateTime = StrToDate(date); 
       	String format = format(dateTime);
       	return format;
       }
       //时间转换  
       public static String format(Date date) {  
           long delta = new Date().getTime() - date.getTime();  
           if (delta < 1L * ONE_MINUTE) {  
               long seconds = toSeconds(delta);  
               return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;  
           }  
           if (delta < 45L * ONE_MINUTE) {  
               long minutes = toMinutes(delta);  
               return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;  
           }  
           if (delta < 24L * ONE_HOUR) {  
               long hours = toHours(delta);  
               return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;  
           }  
           if (delta < 48L * ONE_HOUR) {  
               return "昨天";  
           }  
           if (delta < 30L * ONE_DAY) {  
               long days = toDays(delta);  
               return (days <= 0 ? 1 : days) + ONE_DAY_AGO;  
           }
           
           if (delta < 12L * 4L * ONE_WEEK) {  
               long months = toMonths(delta);  
               return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;  
           } else {  
               long years = toYears(delta);  
               return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;  
           }  
       }  
     
       private static long toSeconds(long date) {  
           return date / 1000L;  
       }  
     
       private static long toMinutes(long date) {  
           return toSeconds(date) / 60L;  
       }  
     
       private static long toHours(long date) {  
           return toMinutes(date) / 60L;  
       }  
     
       private static long toDays(long date) {  
           return toHours(date) / 24L;  
       }  
     
       private static long toMonths(long date) {  
           return toDays(date) / 30L;  
       }  
     
       private static long toYears(long date) {  
           return toMonths(date) / 365L;  
       }  
}